ftp.nice.ch/pub/next/games/action/QuakeEd.s.tar.gz#/QuakeEd/render.h

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extern	int			r_width, r_height;
extern	unsigned	*r_picbuffer;
extern	float		*r_zbuffer;

extern	vec3_t		r_origin, r_matrix[3];
extern	BOOL		r_drawflat;

void REN_ClearBuffers (void);
void REN_DrawCameraFace (face_t *idpol);
void REN_DrawXYFace (face_t *idpol);
void REN_BeginCamera (void);
void REN_BeginXY (void);

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.